When it comes time to upgrade your current AR-15 Pistol Grip, the Ergo Grip STO Pistol Grip is a great one to go with. This is an excellent grip that incorporates internal storage with a hinged floor plate for a secure hold. Molded from highly durable Polymer, the Ergo Grip AR-15 STO Pistol Grip is a rock solid choice if durability is your primary focus.